Microsoft's marketing slogan for Windows XP, designed to showcase the many different things that users can do with the operating system. It appears alongside people flying around and doing things, like a geek version of Crouching Tiger, Hidden Dragon, with the background stylings of Ray of Light by Madonna. According to Microsoft ad execs, it is supposed to be more upbeat and free-flowing than "Start Me Up" which was used to promote Windows 95.
It should be noted that the original slogan for the October 25, 2001 release was "Prepare to fly," which sounds more appropriate given the contents of the commercials, but was shelved after the hijackings of September 11, 2001.